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9.2.3
Function Code 8, Diagnostics
Example 1a:
Clearing all Diagnostic Counters (Sub-function 0x0A) in the frequency inverter with address 1.
Request: Master Frequency Inverter
Field:
SoF
Addr.
ASC
:
0
Hex
3A
30
Response: Frequency Inverter Master
Field:
SoF
Addr.
ASC
:
0
Hex
3A
30 31
The response is an echo of the request. All counters are now set to zero.
Example 1b:
With all counters set to zero, read Diagnostic Counter 4, "Slave Message Count" (Sub-function 0x0E)
from the frequency inverter with address 1.
Field:
SoF
Addr.
ASC
:
0
Hex
3A
30 31
Response: Frequency Inverter Master
Field:
SoF
Addr.
ASC
:
0
Hex
3A
30 31
Example 2:
Read unknown Diagnostic Counter 8 (Sub-function 0x13) from frequency inverter with address 1.
Response: Master Frequency Inverter
Field:
SoF
Addr.
ASC
:
0
Hex
3A
30 31 30
Error Response: Frequency Inverter Master
Field:
SoF
Addr.
ASC
:
0
Hex
3A
30 31
The exception code sent is hexadecimal value 0x01 = ILLEGAL FUNCTION.
60
Fct.Code
Sub-function
1
0
8
0
0
31
30
38
30 30 30 41 30 30 30 30 45 44 0D 0A
Fct.Code
DSet/ Para-No.
1
0
8
0
0
30
38
30 30 30 41 30 30 30 30 45 44 0D 0A
Fct.Code
Sub-function
1
0
8
0
0
30
38
30 30 30 45 30 30 30 30 45 39 0D 0A
Fct.Code
Sub-function
1
0
8
0
0
30
38
30 30 30 45 30 30 30 31 45 38 0D 0A
Fct.Code
Sub-function
1
0
8
0
0
38
30 30 31 33 30 30 30 30 45 34 0D 0A
Except.
Fct.Code
Code
1
8
8
0
1
38
38
30 31 37
Data
0
A
0
0
0
No. of Regs
0
A
0
0
0
Data
0
E
0
0
0
Data
0
E
0
0
0
Data
1
3
0
0
0
LRC
EoF
7
6
CR LF
36 0D 0A
Modbus Agile
Modbus Message Examples
LRC
EoF
0
E
D
CR LF
LRC
EoF
0
E
D
CR LF
LRC
EoF
0
E
9
CR LF
LRC
EoF
1
E
8
CR LF
LRC
EoF
0
E
4
CR LF
02/2011
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